Research On Timing Frequency Controlling Technique In Feed Pumping Station For Economical Operating

Pumping station supplies water for domestic, agricultural and industrial purposes, it consumes a lot of energy. It has a great interest for reducing power expenditure to increase its efficiency. We must adjust the operation method to reach this aim.Timing frequency controlling is in the common use in feed pumping stations. Concerning for the high price of the transducer, most stations adopt the combining of one shifting and several stability pumps. In this way, the problem need to be solved in optimum operation is: seeking for the most suitable operation method and the rotate speed to minimize the total power. Recent theory about this is short as well as the method is complicated.Centrifugal pumps are widely used in feed pumping stations. When the pressure (h) is determinate, so is the working point. And that means the power (P) consumed by electromotor is also determinated. Thus , we can draw a conclusion that there is a certain relationship between P and h and between the discharge (Q) and h. How to apply these relationships to determine the optimum operating method in pumping stations is the key point of this dissertation.In this paper author takes the second-stage pumping station of Nada water supply engineering in Hainan as an example, and makes a deep study on mechanical and electrical property of pumping unit and describes the optimum operating scheme taking minimum total electric-power as an objective function. On the basis of abundant data, author has determined the relationship of power, discharge and pressure. Once the discharge is given, the optimum operating method of the pumps can be determined. This economical operation method has reference significance to most of pumping stations for water supply.